I can't speak for others, who may have less significant issues in their lives, but I remove the lint from my naval daily, about noon. I line up each lint ball, and contemplate the subtle differences from day to day, and week to week. One day I may take pictures, and publish a coffee table book.
Sometimes the memories of each unique lint ball keep me occupied for hours while I stare aimlessly into space during long legs, high in the increadibly boring flight levels.
When not working, I continue research on the Indigo worm.